--  @testpoint:opengauss关键字boolean(非保留)，作为函数名
--关键字不带引号-合理报错
drop function if exists boolean;
create function boolean(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function boolean;

--关键字带双引号-成功
drop function if exists "boolean";
create function "boolean"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "boolean";

--关键字带单引号-合理报错
drop function if exists 'boolean';
create function 'boolean'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `boolean`;
create function `boolean`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/